According to the calculations of the world's most knowledgeable scholars and diviners, Lyranthium is widely believed to be a spherical world approximately 10,000 miles in diameter. Two-thirds of its surface area is covered with water.
It is known to have 8 continents:
Additionally, recent delvings have revealed civilizations below the world's surface, in a vast collection of caverns and tunnels referred to collectively as the Underlands. The boundaries of the Underlands are not yet known.