The Lake Cities are far to the south and west of Darfuria, as can be seen in the left (west) half of the map below. The right (east) half shows the Gulf of Ascalon.
The Lake Cities are centred around an enormous lake called Lake Têtui. This is where a lot of the Japanese and Chinese mythologies are centred and the book Oriental Adventures (https://en.wikipedia.org/wiki/Oriental_Adventures) is ubiquitous.
This is another early map and was too big for the scanner.
Drawn by Cliff.