معجم البلدان is a famous encyclopedia written by Sheikh Yaqut Al-Hamawi between 1220 and 1224 AD. The book is considered an important historical source for describing that era and has been printed several times and translated into various languages. The book contains descriptions of many towns, cities, and countries during that period in eloquent Arabic style. It includes various topics such as the shape of the earth, news of the countries, definitions of measurement units, definitions of the regions, and the lands where the Islamic religion was widespread at that time. The book also mentions deserts and Arab homes based on Arabic poetry, prose, and proverbs from scholars such as Al-Asma'i, Hisham Al-Kalbi, and Abu Saeed Al-Sirafi.

This app provides the entire contents of the book, making it easy for users to access the information. The app is available for Android and is free to download. Overall, معجم البلدان is a must-have app for anyone interested in history, geography, or Arabic literature.