Idjwi

{{short description|Island in Lake Kivu belonging to the Democratic Republic of the Congo}}

{{One source|date=March 2025}}

{{Infobox islands

| name = Idjwi

| image_name = 29.13117E_2.jpg

| image_caption = Idjwi, in the central-southern region of Lake Kivu

| image_size =

| native_name =

| native_name_link =

| nickname =

| location = Lake Kivu

| coordinates = {{coord|02|06|18|S|29|03|36|E|display=inline,title}}

| pushpin_map = Democratic Republic of the Congo#Rwanda#Africa

| archipelago =

| total_islands =

| major_islands =

| area_km2 = 340

| length_km = 70

| width_km =

| highest_mount = Nyamusisi

| elevation_m =

| country = Democratic Republic of the Congo

| country_admin_divisions_title =

| country_admin_divisions =

| country_admin_divisions_title_1 =

| country_admin_divisions_1 =

| country_admin_divisions_title_2 =

| country_admin_divisions_2 =

| country_largest_city =

| country_largest_city_population =

| population = 250,000

| population_as_of = 2009

| density_km2 = 700

| ethnic_groups = Havu (Bany'Idjwi)

| additional_info =

}}

Idjwi, or Ijwi, is an inland island in Lake Kivu which forms part of South Kivu Province in the Democratic Republic of the Congo. At {{convert|70|km|abbr=on}} in length and with an area of {{convert|340|km2|0|abbr=on}}, it is the second-largest lake island in Africa and the tenth largest in the world.{{efn|Ukerewe Island in neighbouring Lake Victoria is considerably bigger than Idjwi, at {{convert|530|km2|0|abbr=on}}.}} Idjwi is roughly equidistant between the Congo and Rwanda, with {{convert|10|to|15|km|0|abbr=out}} separating its western shore from the DRC mainland and a similar distance between its eastern shore and the coastline of Rwanda. The island's southern tip, however, lies only {{convert|1|km}} from a promontory of the Rwandan coast.