The units of measurement in this world are not the same as those on Earth.
As a soul-transmigrating transmigrator, he didn't bring any items that could be used for comparison to determine whether this was a world of giants or ants.
He could only deduce the breadth of this world based on the proportions of his own body.
According to his research, his height had grown to about 1.87 meters, making him the tallest person in the Tulip Family.
Assuming that he and his Earthly self are the same size.
Coral Island is roughly equivalent to the area of a prefecture-level city in China, with an average area of 10,000 square kilometers; Red Crab Island is comparable to the area of a medium-sized province, with an average area of 100,000 square kilometers; then, the Duchy of Sapphire has more than ten islands the size of Red Crab Island, including the much larger Blue Dragon Island.
