As nouns the difference between inland and overland is that inland is homeland, as opposed to foreign country; in composites: domestic while overland is (travel) a trip by land between the uk and the indian sub-continent or australia, or between the uk and south africa.

As an adjective overland is by or across land, especially of travel.
As an adverb overland is over, across, or by land.
https://wikidiff.com/overland/inland

"Inland transport covers all transport activities that go over land, i.e. all modes but air and maritime transport. It hence includes transport by road, by rail, on inland waterways (both passengers and goods) and through pipelines (goods only)".
Eurostat — https://ec.europa.eu/eurostat/statistics-explained/index.php...

Inland:
— within the same country;
https://legal-dictionary.thefreedictionary.com/inland
— of or relating to the interior of a country;
https://www.merriam-webster.com/dictionary/inland
— situated in the interior of a country rather than on the coast (the deserts of inland Australia);
— (mainly British) carried on within the limits of a country; domestic.
https://www.lexico.com/en/definition/inland

"Внутренняя перевозка - перевозка грузов или пассажиров, погрузка и выгрузка которых производится на территории одного государства".
https://online.zakon.kz/Document/?doc_id=36016279

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Официальный перевод документа ООН — https://digitallibrary.un.org/record/461914?ln=ru

Англ.: "...European overland transport, in particular road and rail transport...".
Русс.: "...сухопутные перевозки в Европе, в частности автодорожные и железнодорожные перевозки...".


Transportation overland:
— сухопутная перевозка.
(SAP) — https://www.multitran.com/m.exe?a=3&sc=307&s=overland&l1=1&l...

Overland:
— travelling or done by land;
https://www.lexico.com/en/definition/overland
— by, on, or across land;
— going or accomplished over the land instead of by sea;
https://www.merriam-webster.com/dictionary/overland
— ccomplished, traversing, or passing over the land instead of the ocean;
https://www.ahdictionary.com/word/search.html?q=overland
— an overland journey is made across land rather than by ship or aeroplane;
https://www.collinsdictionary.com/dictionary/english/overlan...
— on land instead of by boat or airplane.
https://www.macmillandictionary.com/dictionary/american/over...

" Inland marine insurance covers items that are transported overland as part of day-to-day business operations".
https://www.investopedia.com/best-business-owners-policy-ins...

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"Основные виды перевозки грузов
— Водным транспортом.
— Железнодорожным транспортом.
— Автотранспортом.
— Авиатранспортом (самолётом, вертолётом).
— Трубопровод".
https://ru.wikipedia.org/wiki/Грузоперевозки