Sigma Islands

{{Short description|Island group in Palmer Archipelago, Antarctica}}

{{Use dmy dates|date=April 2022}}

{{Infobox islands

| name = Sigma Islands

| image_name =

| image_caption =

| image_map = Sigma Islands, Melchior Islands, BAT.svg

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| map = Antarctica

| pushpin_map_caption = Location in Antarctica

| nickname =

| location = Antarctica

| coordinates = {{Coord|64|16|S|62|55|W||display=inline,title}}

| archipelago = Melchior Islands,
Palmer Archipelago

| total_islands =

| major_islands =

| area_km2 =

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| population = Uninhabited

| population_as_of =

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| ethnic_groups = Argentinian

| country = None

| treaty_system = Antarctic Treaty System

}}

The Sigma Islands are a group of small islands and rocks which lie {{convert|3|nmi|km|disp=flip|abbr=on}} north of Eta Island and mark the north limit of the Melchior Islands, in the Palmer Archipelago. The name, derived from the 18th letter of the Greek alphabet, appears to have been first used on a 1946 Argentine government chart following surveys of these islands by Argentine expeditions in 1942 and 1943, The Island was discovered by The Argentinian navigator Vitór Martinez And a group of other navigators in 1874. [https://geographic.org/geographic_names/antname.php?uni=13818&fid=antgeo_121/ Sigma Islands]