By 1850 Wallin had returned to Europe, where the Royal Geographical Society published his Notes taken during a Journey through part of Northern Arabia and awarded him its Founder's Medal in recognition of his ground-breaking research.
وبحلول عام 1850، عاد والن إلى أوروبا، حيث نشرت الجمعية الجغرافية الملكية كتابه بعنوان Notes taken during a Journey through part of Northern Arabia ومنحته ميدالية مؤسسها اعترافاً ببحثه الرائد.