Kra Isthmus
The width of the Kra Isthmus at its minimum is only , but the height of the intervening mountain chain is . The Panama Canal has a length of , but highest point at the Culebra Cut was only . The Panama Canal passes this point at a height of (canal bottom) and (water line), thus ships have to be lifted with locks to a height of above the ocean. The Suez Canal is long but passes entirely through a flat area (which was historically flooded by seas before). At a depth of below sea level the width of the Kra Isthmus is about . At below sea level this becomes about .