البِلَادِ

A word in the Arabic language will either be 1) a verb or 2) a noun or 3) a particle – البِلَادِ is a noun

A noun may either be 1) Definite or indefinite 2) Masculine or feminine 3) Singular, dual or plural 4) Nominative, accusative or genitive

البِلَادُ is the natural state of this definite noun and it changes to البِلَادِ due to: 1) a preposition that precedes it or 2) a possessed noun that precedes it or 3) it’s a noun of dependent declension a) نَعْتٌ / صِفَطٌ adjectives b) التَّوْكِيْدُ emphatic c) المَعْطُوْفٌ conjunction d) البَدَلُ synonym

Lands

To settle, remain in, occupy (a country)

Surah/Below are the 5 verses in the holy Quran containing the genitive nounالبِلَادِ
Verse 
3-196Let not the going to and from in the land of those who disbelieve deceive youلَا يَغُرَّنَّكَ تَقَلُّبُ الَّذِيْنَ كَفَرُوا فِي البِلَادِ
40-4
50-36
89-8the like of which were not created in the landsالَّتِي لَمْ يُخْلَقْ مِثْلُهَا فِي البِلَادِ
89-11who transgressed beyond bounds in the landsالَّذِينَ طَغَوا فِي البِلَادِ