Declension table of ?upadvīpa

Masculine	Singular	Dual	Plural
Nominative	upadvīpaḥ	upadvīpau	upadvīpāḥ
Vocative	upadvīpa	upadvīpau	upadvīpāḥ
Accusative	upadvīpam	upadvīpau	upadvīpān
Instrumental	upadvīpena	upadvīpābhyām	upadvīpaiḥ upadvīpebhiḥ
Dative	upadvīpāya	upadvīpābhyām	upadvīpebhyaḥ
Ablative	upadvīpāt	upadvīpābhyām	upadvīpebhyaḥ
Genitive	upadvīpasya	upadvīpayoḥ	upadvīpānām
Locative	upadvīpe	upadvīpayoḥ	upadvīpeṣu

Compound upadvīpa -

Adverb -upadvīpam -upadvīpāt