Continent
A big land is the biggest types of land on this earth that there are. That is a continent.
たいりく
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
ムー大陸って本当に実在したんですか？
Did the continent of Mu really exist?