Water Sled

This resembles a dog sled with inflated skins in place of runners, enabling the craft to float on the surface of the water. Long leather reins, treated with waterproofing oil, connect with the animals pulling it, usually a team of eight seals or six dolphins. A water sled carries no more than two passengers (about 480 pounds, including the sled), unless the animals pulling it are exceptionally fast and strong. Made to ride as much above the water as in it, the sled can achieve a top movement rate of 15 if pulled by strong steeds, but 9-12 is a more sustainable speed.

[Complete Ranger's Handbook]