Is Yampa a river, lake, or a mountain?

Yampa is both a river and a town.

http://en.wikipedia.org/wiki/Yampa_River

and is a very nice park.

http://parks.state.co.us/Parks/YampaRiver

Yampa is the name of a river, not a lake or a mountain. To find the answer to this question, you can do a quick internet search. Type in "Yampa" and you should be able to find information about the Yampa River, which is located in the western United States. It flows through the state of Colorado and joins the Green River in Utah.