Declension table of ?udarastha

Neuter	Singular	Dual	Plural
Nominative	udarastham	udarasthe	udarasthāni
Vocative	udarastha	udarasthe	udarasthāni
Accusative	udarastham	udarasthe	udarasthāni
Instrumental	udarasthena	udarasthābhyām	udarasthaiḥ
Dative	udarasthāya	udarasthābhyām	udarasthebhyaḥ
Ablative	udarasthāt	udarasthābhyām	udarasthebhyaḥ
Genitive	udarasthasya	udarasthayoḥ	udarasthānām
Locative	udarasthe	udarasthayoḥ	udarastheṣu

Compound udarastha -

Adverb -udarastham -udarasthāt