The isthmuses of Panama and Suez are in our way; we cut through them!
There are some notable points of similarity between these two isthmuses.
Isthmuses are especially naked and rugged; the wave, which wears and mines them on either side, reduces them to the simplest form.
These two isthmuses in the eastern and western hemispheres have some obvious features in common.
The figure of the whole island is oblong, and in some places on the sides, which define its breadth, there are isthmuses.
They made islands and peninsulas and isthmuses of green that were odd and freaky.
The natural route lay obviously through the Caribbean, across some one of the isthmuses, and up the Pacific coast.