Valmiki Ramayana Ayodhya Kanda Sarga 48 Shloka 10

रम्यकाननाः with beautiful groves, अटव्यः forests, महानूपाः expanse of waters, आपगाः च rivers, सानुमन्तः having slopes, पर्वताः mountains, काकुत्स्थम् scion of the Kakutstha dynasty (Rama), शोभयिष्यन्ति will enhance his lustre.

Forests with beautiful groves rivers with vast expanse of waters, mountains with their slopes will enhance the lustre of the scion of the Kakutsthas (Rama).