ICAO		IATA		Other		Location
GQNN		(NKC)				Nouakchott [Intl], MR (388 mi / 624 km SW)
GMAT		TTA				Tan Tan [Tan Tan Airport (Plage Blanche Airport)], MA (392 mi / 631 km N)
GQNB		OTL				Boutilimit, MR (392 mi / 631 km S)
GCRR		ACE				Arrecife [Lanzarote Airport], Lanzarote Island, Canary Islands, ES (411 mi / 661 km N)
GCTS		TFS				Granadilla de Abone [Tenerife Sur (Tenerife South, Reina Sofía)], Tenerife Island, Canary Islands, ES (413 mi / 664 km NW)
		LEG				Aleg, MR (414 mi / 666 km S)
GQNT		THT				Tamchakett [Tamchakett Airport], MR (421 mi / 678 km S)
GCHU						La Laguna (Tenerife) [Hospital Universitario de Canarias Heliport], Tenerife Island, Canary Islands, ES (428 mi / 689 km NW)
		TCI				Tenerife [Metro Area], Tenerife Island, Canary Islands, ES (428 mi / 689 km NW)
		OZL				Orzola [Orzola Ferry Port], Lanzarote Island, Canary Islands, ES (429 mi / 691 km N)
		GGA				La Graciosa (Graciosa Island, Caleta del Sebo) [La Graciosa Ferry Port], Canary Islands, ES (430 mi / 692 km N)
GCXO		TFN				Santa Cruz de Tenerife [Tenerife Norte (Tenerife North, Los Rodeos)], Tenerife Island, Canary Islands, ES (431 mi / 694 km NW)
		UPC				Puerto de la Cruz, Tenerife Island, Canary Islands, ES (433 mi / 696 km NW)
GCGM		GMZ				San Sebas de la Gomera [La Gomera Airport], Canary Islands, ES (435 mi / 700 km NW)
DAOF		TIN				Tindouf [Tindouf Airport], Tindouf, DZ (443 mi / 712 km NE)
GQNE		BGH				Boghé (Bogué) [Abbaye Airport], MR (445 mi / 716 km S)
GCHI		VDE				Valverde [El Hierro], El Hierro Island, Canary Islands, ES (451 mi / 725 km NW)
GOSP		POD				Podor [Podor Airport], Saint-Louis, SN (453 mi / 729 km S)
GQNF		KFA				Kiffa, MR (453 mi / 729 km S)
GMAG		GLN		GM47		Guelmim (Goulimime) [Guelmim Airport], Guelmim, MA (454 mi / 730 km NE)

Perhaps you wanted a map of 23N-13W?