Komentaryo sa Deuteronomio 11:11: Rashi, Chizkuni, Sforno & Or HaChaim

ארץ הרים ובקעת [THE LAND WHITHER THOU ART PASSING IS] A LAND OF HILLS AND VALLEYS — The mountain is better than the plain because in the plain, in an area that takes a Kor of seed, you can sow only a Kor, but in the mountain the summit of which is an area that takes a Kor, from it you have areas for five Kors of seed: four from its four slopes and one on its summit (Sifrei Devarim 39:3).

ארץ הרים ובקעות, “a land of hills and valleys.” No one was able to irrigate his fields by drawing on the waters from the rivers. Seeing that you will depend on rainfall at the appropriate season, you will do well to observe the commandments properly.

למטר השמים תשתה מים. For there are not enough rivers to irrigate the farmland so that the earth requires rainfall to irrigate the crops.

ובקעת — these are the plain lands.