sentences:  Lake Champlain drains into the Richelieu River in Quebec, thence into the Saint Lawrence River, and into the Gulf of Saint Lawrence.The Long Trail, a hiking trail running the length of Vermont, crosses Appalachian Gap between Stark Mountain to the south, and Baby Stark Mountain to the north.The Gap is a very popular route for tourists and affords excellent views of the Champlain Valley, Lake Champlain and the Adirondack Mountains.