Moses Places the Tablets in the Arkby KalebRosendahl

Deuteronomy 11:11

But the land, whither ye go to possess it, is a land of hills and valleys, and drinketh water of the rain of heaven:

The verse belongs to Moses' rehearsal of important instruction to Israel just before they entered Canaan to possess it.
It contrasts Canaan with Egypt: Egypt depended on laborious human irrigation, with seed sown and watered by foot from the river as for a vegetable garden by foot-powered means, while Canaan is a land of hills and valleys that drinks water from the rain of heaven and depends on rain rather than human effort.
It is part of a glowing picture of the advantages and blessings of the good land meant to move Israel's hearts.
That picture assured them during the wilderness wandering that they were being guided to a country where they need never suffer for lack of rain, and gave them abundant occasion for rejoicing.

The land it describes is a good land flowing with milk and honey, with brooks of water and fountains and depths springing out of valleys and hills, with streams and springs flowing from valleys and hills.
It is a land of wheat and barley and vines and fig trees and pomegranates, of olive oil and honey, where bread can be eaten without scarcity and nothing is lacking.
Its stones yield iron and its hills yield copper, brass to be dug from them.
It is a land the Lord cares for, with His eyes always upon it from the beginning of the year to the end of the year.
Moses spoke this description though he himself was shut out through their sin from sharing his people's inheritance.

Possessing the land and receiving abundant rain were promised only on condition of obedience to God's law, diligently keeping the commandments to love the Lord and serve Him with all heart and soul.
Then He would give rain in its season, the early and latter rain, the first rain and the latter rain in due season, so they could gather grain, corn and wine and oil, with grass in the fields for cattle so they could eat and be full, bringing flourishing vegetation.
If their hearts were deceived to turn aside to serve and worship other gods, the Lord's wrath would shut heaven so there would be no rain and the land would not yield fruit.
Then they would quickly perish from the good land given them, with the sky above them like bronze and the earth beneath them like iron, heaven over them as brass and earth under them as iron, and the rain turned to powder and dust until they were destroyed.
The chapter containing the verse gives lessons for later generations as well as for Israel, calling God's people to obey His commandments, with blessing for obedience and a curse for turning aside.