Canto 1 - Boyhood
Bāla-kāṇḍa
Chapter 38: The History of Sagara
Text 1.38.4

अरिष्टनेमिदुहिता रूपेणाप्रतिमा भुवि।
द्वितीया सगरस्यासीत्पत्नी सुमतिसंज्ञिता॥

ariṣṭanemi-duhitā = Kaśyapa’s daughter; rūpeṇa = in beauty; apratimā = she was unparalleled; bhuvi = on earth; dvitīyā = second; sagarasya = Sagara’s; asīt = was; patnī = wife; sumati-saṁjñitā = named Sumati.

Kaśyapa’s daughter named Sumati was Sagara’s second wife. She was unparalleled on earth in beauty.