Sforno on Numbers 13:19/ספורנו על במדבר י״ג:י״ט

1הטובה היא, was the water supply plentiful and not contaminated. Moses had stressed in Deuteronomy 8,7 that G’d was bringing the people to a location which was “good” in the sense that it possessed brooks and rivers with pure water.

2הבמחנים, if they lived in open cities, a sign that they felt secure, not expecting any war,

3אם במבצרים, or in walled, fortified towns, suggesting that the inhabitants were afraid of being invaded. Compare Devorah’s song in Judges 5,7 where she bemoans the fact that her people had ceased to live in open cities.