Declension table of ?śaṅkhadvīpa

Masculine	Singular	Dual	Plural
Nominative	śaṅkhadvīpaḥ	śaṅkhadvīpau	śaṅkhadvīpāḥ
Vocative	śaṅkhadvīpa	śaṅkhadvīpau	śaṅkhadvīpāḥ
Accusative	śaṅkhadvīpam	śaṅkhadvīpau	śaṅkhadvīpān
Instrumental	śaṅkhadvīpena	śaṅkhadvīpābhyām	śaṅkhadvīpaiḥ śaṅkhadvīpebhiḥ
Dative	śaṅkhadvīpāya	śaṅkhadvīpābhyām	śaṅkhadvīpebhyaḥ
Ablative	śaṅkhadvīpāt	śaṅkhadvīpābhyām	śaṅkhadvīpebhyaḥ
Genitive	śaṅkhadvīpasya	śaṅkhadvīpayoḥ	śaṅkhadvīpānām
Locative	śaṅkhadvīpe	śaṅkhadvīpayoḥ	śaṅkhadvīpeṣu

Compound śaṅkhadvīpa -

Adverb -śaṅkhadvīpam -śaṅkhadvīpāt