The roads to Spain and Portugal, 6000km

Parma-Montpellier 576km

Parma (A1) Piacenza (direction Torino A21)

Tortona (A26 Savona-Alessandria)

Genova (direction Savona)

Savona (direction Ventimiglia A10)

Dogana (direction Nice-Aix en Prov. A8)

Aix en Prov. (highway exit, direction Arles-Nimes N113)

Nimes (direction Montpellier A9)

Montpellier

Montpellier (direction Narbonne A9)

Carcassonne

Toulouse (direction Pau N117)

Tarbes ovest

Tarbes (direction Lourdes N21)

Lourdes

Angeles-Gazost (D921)

Luz st.Sauver (direction D918)

Col du Tourmalet (exit M1)

S. Marie de Campan

Tarbes

Tarbes (direction Pau A64)

Salier de Bearn (direction Roncesvalles C1131)

Roncesvalles

Pamplona (N111)

Puente La Reina

Puente La Reina (direction Estella)

Estella (C132)

Vitoria Gasteiz (A68)

Bilbao (direction Santander N634)

Santander

Gijon

Gijon (direction Perth M90)

Luarca (E70)

Mondonedo (direction Baamonde E70)

La Coruna (direction Carballo C552)

Corcubion

Corcubionr (direction Muros C543)

Noya

Santiago de Compostela

Noya

Corcubion

Cabo de Finestrerra

Corcubion

Noya

Padron (direction Vigo A58)

Vigo

Dogana Potogallo

Viana do Castelo

Porto

Vila Nova de Gaia

Vila Nova de Gaia (A1)

Batalha

Fatima

Tomar

Lisbona (Lisboa)

Lisbona

Cascais

Cabo de Roca

Sintra

Lisbona

Lisbona (direction Porto A1)

Coimbra (exit A1)

Celorico de Beira

Vilar Formoso

Vilar Formoso (direction SalamancaN620)

Salamanca

Valladolid

Burgos

Burgos (direction Miranda de E. A68)

Miranda de Ebro (N1)

Alsasua (direction Tolosa N1)

San Sebastian (direction Francia A8)

Biarritz-Bayonne

...just reverse the towns order:
Tarbes, Toulouse, Narbonne, Nimes, Arles, Aix en Provence, Ventimiglia, Genova, Tortona, Piacenza, Parma.