bosom of nature; embrace of nature
Poetic or literary expression for being surrounded by and at peace in nature, often implying a return to a natural, unspoiled state.
He left the city and leads a quiet life in the bosom of nature.
Compound of 自然 (nature) and 懐 (bosom, heart, inner recesses), literally 'nature's bosom'. The phrase is a set expression with a poetic feel.