No rainfall for a year or more may lead to _________________ in that region.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks what may happen in a region if there is no rainfall for a year or more.

2. **Identifying the Impact of No Rainfall**: Consider the effects of prolonged absence of rain. Rainfall is essential for replenishing water bodies such as rivers, lakes, ponds, and wells.

3. **Analyzing Water Levels**: Without rainfall, the water levels in these bodies will decrease. Rivers, lakes, and ponds rely on rain to maintain their water levels.

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