The letter K is located in the western part of the continent, just off the coast. While letters aren't typically used to identify continents, in this specific map, the letter K appears to be marking Africa.
Based on the map you sent, the continent identified by the letter K is Africa.
The map you sent appears to be a simplified map of the world, with only the major continents and a few islands labelled.
The letter K is located in the center of the southern half of the map, and it clearly corresponds to the landmass of Africa.
Here are some additional clues that support this answer:
The shape of the landmass is consistent with the general outline of Africa.
The letter K is positioned near other labels that identify continents, such as F for "South America" and J for "Asia."
Africa is the only continent that fits geographically in the location marked by the letter K.
Therefore, based on the available evidence, it is safe to say that the continent identified by the letter K on the map is Africa.