As hinted by the flavor text, each line of the puzzle can be rearranged into the name of a body of water with one additional letter. The full list is below:
- GOALGON = LAGOON + G
- POUND = POND + U
- ABLY = BAY + L
- FLAKE = LAKE + F
- HENCLANS = CHANNEL + S
- LANTAC = CANAL + T
- CORNEA = OCEAN + R
- BOOKER = BROOK + E
- ARRIVE = RIVER + A
- PLOOM = POOL + M
Reading these extra letters in order gives the answer GULF STREAM, which has a name made up of two bodies of water.