Hello Doug!

“The whole country was said by him to be very lofty and precipitous on the side of the sea, but the country immediately about and surrounding the city was a level plain, itself surrounded by mountains which descended towards the sea; it was smooth and even, and of an oblong shape, (Mountain chains K.M.) extending in one direction three thousand stadia, but across the centre inland it (Mountain chains K.M.) was two thousand stadia. This part of the island looked towards the south, and was sheltered from the north."
Translation and description had been made by Egyptian priest. It means that we have to use the Egyptian (Atlantian) measure (1 stadia = 205m). Thus, we can calculate approximately length of the Atlantis mountain chains (615km and 410km).

The surrounding mountains were celebrated for their number and size and beauty, far beyond any which still exist…“
White arc is surrounded mountains- the city was a level plain, itself surrounded by mountains which descended towards the sea; it was smooth and even, and of an oblong shape. The map exactly shows the description.

best!
Kakha