この川にマスが多い。This river is full of trout.

新潟は雪が多い。 There’s much snow in Niigata

What’s the difference between に and は here ?

I learned only Noun1はNoun2がAdjい/な structure
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2019-09-13T18:14:03.700
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2019-09-14T05:42:47.430
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question
particle-に particle-は particle-が
Difference between NはNが多い and NounにNが多い
The difference might be in the context. N1はN2が多い sounds like an explanation
only for N1, while N1にN2が多い sounds like an explanation compared to several
others.

> この川はマスが多い。  
>  This river has a lot of trout (describing only for this river).
>
> この川にマスが多い。  
>  _This_ river has a lot of trout (compared to some other rivers).

But は is sometimes used to imply a comparison with others. It may depend on
the context.
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2019-09-14T02:51:15.390
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answer