High Percent Dispute

Guayana Esequiba is a disputed territory worth 159,500 sq kms. This is usually not huge number, but considering that Guyana's total area is 214,970 sq kms, around 74% of their country is claimed by Venezuela. Considering that Guyana's territory is also claimed by Suriname, I guess it would be close to the highest percentage of a country's territory being in dispute...

PS .. not considering Taiwan, Kosovo etc.