Why does hamlet say that Denmark is a prison?

Hamlet describes Denmark as a prison to express his feelings of entrapment and despair. He feels confined by the corruption and moral decay surrounding him, particularly following his father's death and his mother's hasty remarriage to Claudius. This sense of imprisonment reflects his internal struggle and disillusionment with the world, as he grApples with betrayal and the weight of his own responsibilities. Ultimately, his perception of Denmark as a prison underscores his existential crisis and isolation.