この森には

in this forest

→ 此の
phrase Rare #32,924
in this forest この森 means “this forest,” and には marks it as the location or topic. It is commonly used when saying that something exists or happens in this forest.
JA: この森には珍しい鳥が住んでいます。
EN: Rare birds live in this forest.

この森にはたくさんのがいる

There are many birds in this forest.

この森には幽霊がいると信じられている

It is believed that there are ghosts in this forest.

この森には多くの野生動物がいます

There are many wild animals in this forest.

この森には樫の木があります

There are oak trees in this forest.