None, El Salvador shares a border with Mexico
This is a trick question, El Salvador is an Island.
A narrow strip of water connecting the Aegean Sea to the Sea of Marmara by Turkey
A mythical place visited by Greek hero Odysseus
A group of Islands in East of Italy
An outcropping of Islands in Greece
A small sea in the Mediterranean, west of Greece
A historical kingdom which in current day goes by Tajikistan
A protectorate of China
A mountain range in the Himalayas
An Island near the south tip of Malaysia
A small country nestled between China and India
Saint Kitts and Nevis
Saint Vincent and the Grenadines
Republic of Korea
Sao Tome and Principe
A narrow body of water between Greenland and Canada
A mythical body of water connecting the Atlantic and Pacific Ocean through North America, a name later given to a shipping route over Canada.
A series of locks connecting Lake Superior to Lake Huron
A section of the Oregon Trail through the mountains in Montana, known for its treachery.
A previous trade route, now Highway, connecting Alaska to the continental 48 states.
Here's an interesting quiz for you.