[Wluwsdtn]

Atlantic Ocean

Pacific Ocean

Rio Grande

Lake Michigan

Various small rivers and creeks

Swam/swum being the past tense of to swim

[Paiblyelaxy]

Pacific, Atlantic, Mediterranean, Arabian, Bengal, Andaman, Gulf of Thailand, tons of lakes and rivers whose names I forget.

[vipbunter]

Pacific and Indian Oceans. Yosemite River, which is runoff from snowpack and is about 1 degree C.

[DzjwMKo5]

In a river of my enemies' blood.

[temansertewek]

I'm swimming permanently in the sea of time and in the stream of consciousness

[snunsebrugs]

Detroit River, Lake Huron, Lake Michigan, Lake Superior, Lake St. Clair, and a few others in Michigan.

[Spongebob]

Atlantic and Pacific Oceans.

Carribean Sea (Warmest).

Gulf of Mexico

Lake Superior (Coldest) and Michigan.

Mississippi, Wisconsin and Rock Rivers (the Wisconsin and Rock Rivers both flow into the Mississippi).

Large numbers of small lakes and rivers in Northern Wisconsin, Upper Michigan, Quetico Privincial Park and the Boundry Waters Canue Area in Northern Minnesota

[abubycera]

Atlantic, Pacific, Indian

Carribean Sea, Red Sea

Persian Gulf, Chesapeake Bay, Gulf of Mexico

James River, Rio Grande, Alegash, and god only knows how many other rivers.

[AriaDesser]

I've swam across the river Styx; I wasn't about to pay that greedy rat bastard, Charon, two of my hard-earned gold pieces for a friggin' boat ride.

[GoblinGaga]

I've swum in the Mediterranean Sea. I think that's about it.

My life-expectancy would probably drop by several years were I to swim in a nearby river or lake.

[milfovoxapl]

Yeah, the North Sea is definitely the most "bracing" of them all!