The word is erets which means Earth, land, ground, country, territory.
Usage: The Hebrew word "erets" is a versatile term used extensively throughout the Old Testament. It primarily denotes the physical earth or land, encompassing everything from the entire planet to specific regions or territories. It can refer to the ground or soil, a country or nation, and even the people inhabiting a land. The term is often used in contrast to "shamayim" (heavens), highlighting the distinction between the earthly and the divine realms.
https://biblehub.com/hebrew/776.htm
When a word can be used several ways I just go to the lexicon which lists just how the word is being used it's meaning. The Lexicon does not list exactly for Genesis 10:25, however for other uses of the word erets in Genesis 10 it does.
2 land =
a. country, territory, שִׁנְעָר ׳א
Genesis 10:10, מִצְרַיִם ׳א
Genesis 21:21; compare also
Genesis 10:11;
Genesis 11:28,31;
Genesis 13:10;
Genesis 47:6,27;
Genesis 50:8;
Isaiah 7:18;
Isaiah 23:1;
Isaiah 23:13;
Isaiah 27:13;
Psalm 78:12;
Jeremiah 25:20;
1 Chronicles 1:43; personified
Isaiah 62:4;
Ecclesiastes 10:16,17.
https://biblehub.com/hebrew/776.htm
Genesis 10:5 By these were the isles of the Gentiles divided in their lands /erets; every one after his tongue, after their families, in their nations.
Genesis 10:10-11
10And the beginning of his kingdom was Babel, and Erech, and Accad, and Calneh, in the land/erets of Shinar.
11Out of that land/erets went forth Asshur, and builded Nineveh, and the city Rehoboth, and Calah,
So for me between how the word divided was used with tongues and the word land/erets is used in the whole of Genesis 10, I concluded that verse 25 would fit in with division by language and nations bro.
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