This is my Tunnels and Trolls web site.
Lake, and one bay, sizes.
on continent The Rocks; near Dread Mountain: 499,326.22 square miles
bay near the city-state Sanctuary: 1,863,868.88 square miles including the 5 islands in the bay.
on continent Shur Land; Lake of Sundering: 15,763,377.25 square miles
on continent Waz-Nol; Grab Lake: 49,259.81 square miles
lake on continent Zogand: 97, 285.26 square miles
On smaller scale maps there will be small lakes.