Have you ever looked at a competition swimming pool and wondered about the markings in and around the pool?
For new swim parents and swimmers, the markings on and around the pool can be confusing — and maybe even overwhelming at first. But these lines and markings are more than just decoration. They’re essential tools that help swimmers navigate the pool, time their turns, and execute races with precision.
While recreational pools or local facilities may have some variation, most competition-ready pools follow standard guidelines set by governing bodies like USA Swimming, FINA, and NCAA. Learning what these markings mean can help you better understand the sport and give your swimmer an edge as they develop.
Center Line, Turning T, and Target Line

Center Line
The center line is the bold black line at the bottom of each lane that helps swimmers keep straight in their lane. For officials, the center line serves as a critical reference point and plays a significant role in maintaining fairness and accuracy during races. This precisely marked line runs along the length of the pool, dividing it into two equal and symmetrical halves.
Here are a few key details explaining the importance and characteristics of the center line:
Starting Point
During starts, swimmers position themselves along the edge of the pool, with the center line guiding their alignment. The starting blocks are typically in line with the center line, allowing swimmers to dive into the water in a straight line, minimizing any advantages or disadvantages related to lane positioning.
Underwater Orientation
The center line serves as a visual reference point during a race. The swimmer can see the bottom of the pool during a race, and this line must be clearly visible to help the swimmer maintain a more effective, straight swim line.
In essence, the center line in a competitive swimming pool serves as a fundamental element, contributing to the precision and efficiency of races. Swimmers, officials, and spectators all rely on this central marker to uphold the standards of competitive swimming.
Turning T
The “turning T” in a competitive swimming pool is a critical component that serves as a reference point for swimmers during their turns. This T-shaped marker is located at the end of each pool lane, alerting the swimmer that the wall is near. Its primary purpose is to assist swimmers in executing precise and efficient turns, especially during events that involve multiple laps.
As swimmers approach the turning T, they use it as a visual cue to gauge their proximity to the wall and prepare for the impending turn. The horizontal bar of the T is positioned 2.00 meters (6 feet 7 inches) from the wall, providing a clear visual indicator of the ideal point to initiate a turn.
The turning T plays a crucial role in promoting consistency and adherence to rules, especially in strokes like Backstroke, where the swimmer must finish on their back. It ensures that swimmers execute their turns at the same point, contributing to a level playing field for all competitors.
Target Line
Additionally, a target line is the plus sign marking at the end of each lane, centered on the wall. The horizontal line on the plus sign should be 1.6 feet wide and be positioned 1 foot below the water’s surface. This is a critical reference point that assists swimmers in maintaining precise alignment and executing turns efficiently.
When approaching the target line, swimmers focus on maintaining a streamlined and hydrodynamic position in the water. The goal is to reach the target line with precision, aligning their body in such a way that the push-off from the wall is powerful and propels them efficiently into the next lap.
For flip turns, swimmers use the target line as a visual cue to initiate the rotation. As they near the wall, they execute a quick somersault, ensuring that their feet make contact with the wall at or near the target line. This strategic placement allows swimmers to push off the wall with maximum force, utilizing the energy generated from the turn to gain momentum for the subsequent lap.
In open turns, where swimmers touch the wall with one or both hands before pushing off, the target line serves as a reference for the optimal point of contact. Swimmers aim to touch the wall precisely at or near the target line, enabling them to execute a swift and efficient turn.
In essence, the target line acts as a visual guide and reference point, promoting consistency and precision in turn execution. It is a fundamental element of competitive swimming strategy, allowing swimmers to harness the power of their turns and maintain a competitive edge in the race.
Back Stroke Flags

The flags hanging across the pool at each end alert the swimmer that they are 5m from the pool end. This helps them gauge their backstroke count in preparation for their turns and is referred to as “Back Stroke Turn Indicators.”
Backstroke flags, also referred to as “Back Stroke Turn Indicators,” in a competitive swimming pool serve as visual aids to help swimmers gauge their proximity to the pool wall during the backstroke portion of the race. These flags are suspended across the width of the pool, typically positioned approximately 5 meters (15 feet) from each end, creating a clear reference point for swimmers as they approach the wall.
Visual Cue
The primary purpose of backstroke flags is to alert swimmers that the pool wall is imminent, allowing them to prepare for a smooth and well-timed turn. As swimmers swim on their backs, their line of sight is directed upward, making it challenging to judge the pool’s end accurately. The flags act as a tactile and visual cue, signaling swimmers to initiate their turn and subsequent push-off.
Each flag is usually a bright color, contrasting with the pool’s water, making them easily visible against the backdrop. The standard placement ensures consistency across competitive swimming venues, allowing swimmers to develop a sense of distance and timing during their training and races.
Stroke Counts
Competitive swimmers often incorporate the backstroke flags into their race strategy, counting the number of strokes taken from the last flag to optimize their approach to the wall. This strategic use of the flags is crucial in maintaining speed and precision during backstroke races, contributing to overall race efficiency.
These flags not only enhance safety but also play a crucial role in helping swimmers execute well-timed and effective turns. A swimmer’s stroke count from this marking to the wall is very important and keeps the swimmer from hitting their head on the end of the pool.
A new product, Hammerhead Swim Caps, was designed to help young swimmers avoid head injuries. The unique design provides a protective barrier within the swim cap to act as a cushion as new swimmers are learning their stroke counts.
Lane Lines or Lane Ropes

The lane lines, a.k.a. lane ropes or swimming lane markers, are the floating lines separating each lane. Colors can vary from pool to pool and World Aquatics has specific colors for holding competitions. However, a new swimmer will need to know a few marks along those lines.
In a competitive swimming pool, lane lines serve as essential components that not only delineate individual swimming lanes but also play a crucial role in optimizing performance and maintaining fair competition.
Buoyancy and Floatation
Lane lines typically consist of a series of buoyant and flexible disks connected by a cable. These buoyant components help the lane lines float on the water’s surface, ensuring they are easily visible and do not impede swimmers’ movements.
Reduction of Waves
One primary function of lane lines is to mitigate the impact of waves generated by swimmers. As swimmers move through the water, they create disturbances that can affect neighboring lanes. Lane lines disrupt the waves, preventing them from traveling across the pool and interfering with competitors in adjacent lanes.
Division of Lanes
Lane lines physically separate each lane, providing a clear boundary for swimmers and ensuring that races are conducted fairly and safely. They help maintain order in the water, promote even spacing, and reduce the chances of collisions or interference between athletes.
Visual Guidance
Lane lines offer visual guidance for swimmers, helping them maintain a straight course. The contrasting color of the lane lines against the pool water aids swimmers in orienting themselves within their designated lane, reducing the likelihood of veering off course. Additional markings along the lines indicate key waypoints that are important during a race.
In essence, lane lines in a competitive swimming pool are meticulously engineered to create optimal conditions for fair and efficient competition, while also aiding swimmers in maintaining their focus, trajectory, and overall performance.
Most lane lines are purchased through Competitor, the official lane line of USA Swimming and NCAA Swimming.
Additional Lane Line Marks
Three marks are highlighted along the lines to help te swimmer identify key waypoints that are important in a competion swim.
False Start Rope (15 Meter Mark)
From the blocks, the first will be the 15m mark or “False Start Rope,” the next is the pool center, and the last is the opposing 15m mark. These will look different if you are looking at a long-course or short-course pool.
The 15m marker is important because the swimmer must break the surface of the water BEFORE this mark or they will be disqualified.
Pool Center Line
This is simply the halfway point in the length of the swimming pool.
In World Aquatics-approved pools, you will see specific colors for lane lines.
- Lanes 1 and 8 will be green (2 ropes on the outside of the lanes)
- Lanes 2, 3, 6, and 7 will be blue (4 ropes in between)
- Lanes 4 and 5 will be yellow (3 ropes in the center of the pool – these are the 2 fastest swimmers in the heat)
See the diagram below. Provided by Wikimedia.

Above diagram by Cmapm – Own work, Public Domain, View on WikiMedia.org
So next time you are at the pool, you will have a better understanding of the markings around the pool.
By understanding their purpose, your swimmer will feel more comfortable in the pool, and you can sit back and watch your amazing swimmer with a deeper understanding of the amazing sport of swimming!
