The IGN TOP 25 hiking map No. 2103 ET covers the following area: Calais, Caps Area, Guînes Forest, Caps & Marais d'Opale Regional Nature Park.
- Contour lines at 10-metre intervals.
- Detailed legend: vegetation, rocks, transport routes down to the smallest paths, buildings down to individual sheds, woodland, isolated trees, rivers, springs and more.
- Waymarked trails and tourist information are shown.
- Scale: 1:25,000 (1 cm = 250 m).
Municipalities covered: Calais, Marck, Hermelinghen, Leulinghen-Bernes, Rety, Wissant, Caffiers, Andres, Landrethun-lès-Ardres, Hervelinghen, Coulogne, Fiennes, Audembert, Escalles, Guînes, Les Attaques, Fréthun, Pihen-lès-Guînes, Bouquehault, Audresselles, Bonningues-lès-Calais.
Places to discover: PNR Caps et marais d'Opale, Étang d'Ardres, Cap Gris-Nez, Dunes de la Manchue, Dunes de la Slack, Cap Blanc-Nez, Colonne Blanchard, Monastère des Bourgeois de Calais, Tour du Guet, Tour de l'Horloge, Monastère de Beaulieu Chapel, Fort Mahon, Blacourt Castle, Camp de César.