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Falmouth Spring

Falmouth Spring
Falmouth Spring at low water./ T. Scott, Wikimedia Commons / public domain

WorldBlue  In short

Frequently Falmouth Spring is called “the shortest river in the world”. This is not a true spring, but a collapsed, 137 m long cave section – karst window.

3 out of 10 stars 30.3%

GPS coordinates
30.3608 N 83.135 W
Location, address
North America, United States, Florida, Suwannee County, in Falmouth, south of US 90, east of 185th Road. A nature trail leads towards the spring.
Falmouth Springs
Average discharge
1,553 l/s (1997-2023, 1.)

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WorldYellow In detail

Sometimes Falmouth Spring is called the shortest river in the world by the local tourist industry. This, to some extent, characterizes this unusual natural landmark. Falmouth Spring is a karst window – a collapsed section of a cave, with a cave river in it.

This visible river section is 137 m long. It is a picturesque area surrounded by Florida swamp forest (image does not do favor to it – it is taken at low water), this place is like a a small, charming wonder in pristine nature. Limestone ledges surround the small lake-river-spring.

Water continuously comes up in one side and disappears underground in the other end. In the middle part at higher water is shallower part that is lined with white sand.

Spring pool is some 27 by 25 m large. Depth of the spring vent is around 12 m – this is a conical funnel that is covered with sand, some limestone is seen (2.).

In the other end is siphon. From the surface it may seem calm. Nevertheless, this is a dangerous place for divers who might get sucked into it with little chance to get out. This is one of entrances into an underwater cave – the enormous Cathedral-Falmouth system. This giant underwater cave is 18 893.7 m long and up to 130.8 m deep.

Unfortunately, similar to many other springs in Florida, Falmouth Spring is rather polluted with nitrates from the agricultural runoff and, as a result, lots of algae grow in it.


  1. Falmouth Springs. Suwannee River Water Management District, Water Data Portal. Last accessed on 9th September 2023.
  2. First Magnitude Springs of Florida, Florida Geological Survey Open File Report No. 85. 2002. Last accessed on 22nd September 2023.

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