In the sentence
In long, narrow bays, tides are higher /highest than in other places.
Higher flows smoother but are we comparing more than 2 places so pick highest?
No, "higher than..."
You'd never use "highest than ... "
What about this one?
Storms in the North Sea are worse/worst in the winter than at any other time.
worse
Higher and worse are both comparatives and are used with than.
In the sentence, we are comparing the tides in "long, narrow bays" to other places. When comparing two items, we use the comparative form "higher." However, in this case, we are not just comparing two places but rather the tides in long, narrow bays with the tides in multiple other places.
To determine whether to use "higher" or "highest," we need to consider the number of places being compared. If we are comparing the tides in long, narrow bays to three or more other places, we use the superlative form "highest." This is because the superlative form is used to compare one thing to multiple other things.
Therefore, in this sentence, "highest" would be the correct word choice because we are comparing the tides in long, narrow bays to the tides in multiple other places.