What kind of landform is tallest of all, with a spiky top where snow may fall?

This landform is found at the bottom of mountains and very tall hills.

To get to this landform, a boat you may ride, since water surrounds it on every side.

Which type of landform stretches into the tides, surrounded by water on three of its sides?

This large body of water is surrounded by land. It's a great place to fish and swim, if you can.

When the wind and the rain wear a mountain away, the mound that is left is this landform, they say.

Which type of landform is just one of seven? It's a really big place split up into nations.