Environmental education efforts in Cambodia have been largely informal (outside of a classroom setting) and have typically been adopted on a per-project basis at a local scale, such as in support of community forestry or community fishery initiatives [24; 25]. Cambodia has a high literacy rate of 81% [26], but 76% of the population lives in rural areas [27], which can present logistical challenges to delivering educational programs. However, Cambodians have become extensively connected digitally: as of 2019, there were 8.8 million registered Facebook accounts in Cambodia, which is roughly eight accounts for every ten of the 10.58 million people between the ages of 15 and 64 in a country of 16.48 million [28; 29]. This presents a sizeable opportunity for reaching large numbers of people through social media and other digital forms of communication. While communication can take multiple forms, the various approaches discussed in this review require common essential elements, such as identifying the intended audience and choosing the right tools to engage with that audience [30; 31; 32; 33]. Defining the scope of an audience (e.g., national vs. international) will influence the choice of language for communication, as well as the platforms used [30; 34]. Successful communication campaigns also rely on crafting compelling messages that resonate with the target audience [30; 34; 35]. The same message can be adapted to different media or communication tools to broaden its reach. Our discussion of communication for conservation incorporates tools and strategies from the fields of environmental education and science communication, recognizing that, while these fields are often defined differently, they have great overlap in practice [32; 33; 36]. While others differentiate strategies of communication, education, outreach, and engagement based on purpose, audience, setting, or level of audience participation [32; 37; 38; 39], our focus is on discussing the communication tools themselves from the perspective of a conservation organization, with the understanding that a single tool can be used for multiple purposes or audiences. We have grouped tools based on whether audience engagement typically occurs (1) in person or (2) remotely. While the COVID-19 pandemic has demonstrated how many of the in-person tools can be adapted to remote or virtual applications, here, we predominantly focus on their traditional in-person uses. This review compares the benefits and challenges of seven types of communication tools to aid conservation, which can generally be classified as (1) in-person education and outreach (including school visits, public events, and immersion experiences); and (2) media-based outreach (including print products, traditional news media, video, and social media). We also explore a cross-cutting approach that combines in-person and media-based elements for outreach and engagement. For each strategy, we provide a review of available published literature around the role of this strategy in communication for conservation, and compare strengths and weaknesses of the various strategies, such as the level of effort required, accessibility, and relative reach (Table 1). We also highlight examples from a case study based on Wonders of the Mekong (WOM), a multidisciplinary collaborative project focused on Cambodia and funded by the U.S. Agency for International Development (USAID). The WOM project aims to maintain the ecological, cultural, and economic integrity of the vital Mekong River system through a three-pronged approach of (1) interdisciplinary research, (2) capacity building, and (3) education and outreach. This third component includes raising awareness about the value of the river's many extraordinary \"wonders\", such as diverse species, abundant fisheries, a unique and productive river system, and rich cultural heritage.