| Name | Country | Feature class | Latitude | Longitude | |
|---|---|---|---|---|---|
401  | Isinka Isinka,Isinko | Madagascar, Betsiboka Tsaratanana > Andriamena > Isinko | populated place | S 17° 5′ 0'' | E 47° 14′ 0'' |
| 402 | Isinja | Madagascar, Sofia Befandriana Avaratra > Ankarongana > Anjozoro | populated place | S 15° 21′ 0'' | E 48° 46′ 0'' |
| 403 | Isingo | Madagascar, Androy Tsihombe > Antaritarika > Antsakoamanga | populated place | S 25° 19′ 0'' | E 45° 47′ 0'' |
404  | Isindro | Madagascar, Amoron'i Mania | stream | S 20° 30′ 0'' | E 46° 55′ 0'' |
| 405 | Isimatahodaza | Madagascar, Itasy Arivonimamo > Ambatomanga > Ambohitrinibe | populated place | S 18° 52′ 0'' | E 47° 12′ 0'' |
| 406 | Isikiory | Madagascar, Analanjirofo | stream | S 15° 10′ 0'' | E 49° 35′ 0'' |
| 407 | Isihy | Madagascar, Androy Ambovombe District > Andalatanosy > Modoioke | populated place | S 24° 37′ 0'' | E 45° 27′ 0'' |
| 408 | Iseta | Madagascar, Upper Matsiatra Lalangina > Taindambo > Maromangaika | populated place | S 21° 28′ 0'' | E 47° 13′ 0'' |
| 409 | Isesy | Madagascar, Diana Ambilobe > Tanambao Marivorahona > Bobasatrana | populated place | S 13° 8′ 0'' | E 49° 5′ 0'' |
| 410 | Isatro | Madagascar, Ihorombe Ivohibe > Maropaika > Maropaika | populated place | S 22° 43′ 0'' | E 46° 58′ 0'' |
411  | Isatrapoto | Madagascar, Ihorombe Ihosy > Analaliry > Amanda | mountain | S 22° 52′ 0'' | E 46° 16′ 0'' |
| 412 | Isatra | Madagascar, Atsimo-Atsinanana Vangaindrano > Fenoambany > Isatra | populated place | S 23° 50′ 0'' | E 47° 31′ 0'' |
| 413 | Isata | Madagascar, Upper Matsiatra Ambohimahasoa > Vohitrarivo > Andrefanambositra | populated place | S 21° 4′ 0'' | E 47° 0′ 0'' |
| 414 | Isarodrano | Madagascar, Anosy Taolagnaro > Mandromondromotra > Hovatraha | hill | S 24° 57′ 0'' | E 47° 5′ 0'' |
| 415 | Isaonjo | Madagascar, Bongolava | stream | S 17° 50′ 0'' | E 46° 27′ 0'' |
| 416 | Isangory | Madagascar, Anosy Betroka > Mahabo > Ankeniheny | mountain | S 23° 37′ 0'' | E 46° 7′ 0'' |
| 417 | Isandrano Rivière | Madagascar, Bongolava | stream | S 18° 17′ 0'' | E 46° 30′ 0'' |
| 418 | Isandrano | Madagascar, Betsiboka | stream | S 17° 43′ 0'' | E 46° 48′ 0'' |
| 419 | Isandra Isandra,Isandra Fleuve | Madagascar, MG.02 | stream | S 24° 5′ 0'' | E 47° 28′ 0'' |
| 420 | Isandra Isandra,Isandra Riviere,Isandra Rivière | Madagascar, Upper Matsiatra | stream | S 21° 13′ 0'' | E 47° 0′ 0'' |
| 421 | Isandra | Madagascar, Vakinankaratra | stream | S 19° 55′ 0'' | E 46° 59′ 0'' |
| 422 | Isanalava | Madagascar, Upper Matsiatra Vohibato > Soaindrana > Imarotavy | populated place | S 21° 31′ 0'' | E 47° 2′ 0'' |
| 423 | Isampeza | Madagascar, Androy Ambovombe District > Marovato Befeno > Namalaza I | populated place | S 25° 8′ 0'' | E 45° 43′ 0'' |
| 424 | Isalokely | Madagascar, Menabe Miandrivazo > Dabolava > Madiokely | hill | S 19° 51′ 0'' | E 45° 45′ 0'' |
| 425 | Isaloha du Nosikely Fleuve Isaloha du Nosikely,Isaloha du Nosikely | Madagascar, MG.02 | stream | S 22° 39′ 0'' | E 47° 52′ 0'' |
| 426 | Tangorombohitr’ Isalo Isalo,Massif de L' Isalo,Massif de L’ Isalo,Monts Isalo,Tangorombohitr' Isalo,Tangorombohitr’ Isalo | Madagascar, | mountains | S 22° 45′ 0'' | E 45° 15′ 0'' |
| 427 | Massif Roiniforme de l’ Isalo | Madagascar, Ihorombe | mountains | S 22° 21′ 0'' | E 45° 20′ 0'' |
| 428 | Massif de l’ Isalo | Madagascar, Atsimo-Andrefana | mountains | S 23° 12′ 0'' | E 45° 5′ 0'' |
| 429 | Isalo Esalo,Isalo | Madagascar, Anosy Taolagnaro > Manambaro > Esalo | populated place | S 24° 59′ 0'' | E 46° 52′ 0'' |
| 430 | Isalo  Isalo,aysalw,isaru,ایسالو,イサル | Madagascar, Menabe Miandrivazo > Isalo > Isalo | populated place | S 19° 44′ 0'' | E 45° 26′ 0'' |
| 431 | Isalaza Isalaza,Salaza | Madagascar, Ihorombe Ihosy > Mahasoa > Salaza | populated place | S 22° 14′ 0'' | E 46° 7′ 0'' |
| 432 | Isakia | Madagascar, Androy Beloha District > Beloha > Tehodo Riambe | populated place | S 24° 57′ 0'' | E 44° 50′ 0'' |
| 433 | Isakely | Madagascar, Vakinankaratra | stream | S 20° 15′ 0'' | E 46° 38′ 0'' |
| 434 | Isakatelo | Madagascar, Anosy Taolagnaro > Ifarantsa > Ivorona | mountain | S 24° 48′ 0'' | E 46° 56′ 0'' |
| 435 | Isaka-Ivondro Isaka,Isaka-Ivondro,Ivondro,aysaka-aywwndrw,ایساکا-ایووندرو | Madagascar, Anosy Taolagnaro > Isaka-Ivondro > Etsilesy | populated place | S 24° 48′ 0'' | E 46° 51′ 0'' |
| 436 | Isakabe | Madagascar, Anosy Taolagnaro > Ambatoabo > Betanimena | populated place | S 24° 49′ 0'' | E 46° 34′ 0'' |
| 437 | Isaka | Madagascar, Upper Matsiatra Isandra > Mahazoarivo > Ankazotana | populated place | S 21° 26′ 0'' | E 46° 53′ 0'' |
| 438 | Isaka | Madagascar, Upper Matsiatra Ambohimahasoa > Isaka > Ambalafeno Namboarina | populated place | S 21° 8′ 0'' | E 47° 1′ 0'' |
| 439 | Isaka | Madagascar, Amoron'i Mania Ambatofinandrahana > Mangataboahangy > Maharivo | populated place | S 20° 21′ 0'' | E 46° 19′ 0'' |
| 440 | Isaheny-Anivorano | Madagascar, Ihorombe Ihosy > Ilakaka > Saheny II | populated place | S 22° 49′ 0'' | E 45° 20′ 0'' |
| 441 | Isahena Isahena,Isanela | Madagascar, Atsimo-Andrefana | stream | S 21° 41′ 0'' | E 45° 8′ 0'' |
| 442 | Isahara Isahara,aysahara,ایساهارا | Madagascar, Atsimo-Atsinanana Vangaindrano > Isahara > Isahara | populated place | S 23° 43′ 0'' | E 47° 21′ 0'' |
| 443 | Isahanato | Madagascar, Anosy | stream | S 23° 39′ 0'' | E 45° 40′ 0'' |
| 444 | Isahalava | Madagascar, Upper Matsiatra Lalangina > Androy > Amindrabe | populated place | S 21° 25′ 0'' | E 47° 22′ 0'' |
| 445 | Isahalava | Madagascar, Upper Matsiatra Isandra > Ambalamidera II > Ambalamidera II | populated place | S 21° 20′ 0'' | E 46° 49′ 0'' |
| 446 | Isaha | Madagascar, Amoron'i Mania | stream | S 20° 24′ 0'' | E 47° 12′ 0'' |
| 447 | Isafotra | Madagascar, Alaotra Mangoro | stream | S 18° 42′ 0'' | E 47° 58′ 0'' |
| 448 | Irony | Madagascar, Sofia | stream | S 14° 43′ 0'' | E 48° 7′ 0'' |
| 449 | Ironona Irohono,Ironona | Madagascar, Diana Antsiranana II > Andranofanjava > Ironona | populated place | S 12° 23′ 0'' | E 48° 58′ 0'' |
| 450 | Irondro Irondra,Irondro,ayrwndrw,ایروندرو | Madagascar, Vatovavy Region Mananjary > Antsenavolo > Irondro | populated place | S 21° 24′ 0'' | E 47° 59′ 0'' |
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