It is the Gulf of California or Sea of Cortes.
It's narrowest at Lake Itasca in north central Minnesota.
Mexico's narrowest point is known as the Isthmus of Tehuantepec. At its narrowest point, it stretches for 200 Km (124 miles), separating the Gulf of Mexico and the Pacific Ocean.
North America and South America. The point of division is generally the narrowest part of the isthmus of Panama.
yes
It is a gulf off the coast of North Vietnam and part of the South China Sea.
The narrowest part of the Mid-Atlantic Ridge is about 1,000 km wide.
gvb
Its called the "waist"
South China Sea: which is a part of the Pacific Ocean
Between Cape Terawhiti in the North Island and Perano Head in the South Island. They are only 23 kilometres apart.
pommel