.mw-parser-output .hidden-begin{box-sizing:border-box;width:100%;padding:5px;border:none;font-size:95%}.mw-parser-output .hidden-title{font-weight:bold;line-height:1.6;text-align:left}.mw-parser-output .hidden-content{text-align:left}@media all and (max-width:500px){.mw-parser-output .hidden-begin{width:auto!important;clear:none!important;float:none!important))You can help expand this article with text translated from the corresponding article in Italian. Click [show] for important translation instructions. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Italian Wikipedia article at [[:it:Strada nazionale 21 (Cambogia)]]; see its history for attribution. You may also add the template ((Translated|it|Strada nazionale 21 (Cambogia))) to the talk page. For more guidance, see Wikipedia:Translation.
National Highway 21 shield
National Highway 21
Location
CountryCambodia
Highway system

National Road 21 is a national road of Cambodia. It connects Phnom Penh to An Phu District in Vietnam. It runs along the bank of the Bassac River.

Further reading

Kunthear, Mom. "Strategic National Road 21 stretch opens". Retrieved 2022-12-19.