Table 6.
Top 20 most cited keywords.
| Item | freq | year_q1 | year_med | year_q3 |
|---|---|---|---|---|
| Sustainability | 2456 | 2014 | 2018 | 2021 |
| Ecotourism | 1252 | 2013 | 2018 | 2020 |
| Sustainable development | 1162 | 2014 | 2018 | 2021 |
| Tourism | 892 | 2017 | 2020 | 2021 |
| Tourist destination | 651 | 2015 | 2019 | 2021 |
| Tourism management | 580 | 2011 | 2017 | 2020 |
| Tourism market | 322 | 2014 | 2019 | 2021 |
| Perception | 278 | 2017 | 2019 | 2021 |
| Tourism economics | 253 | 2012 | 2017 | 2020 |
| Environmental protection | 211 | 2011 | 2016 | 2020 |
| Environmental impact | 190 | 2012 | 2016 | 2020 |
| Economic development | 183 | 2016 | 2020 | 2021 |
| Biodiversity | 167 | 2011 | 2017 | 2020 |
| Protected area | 150 | 2012 | 2016 | 2020 |
| Covid-19 | 116 | 2021 | 2022 | 2022 |
| Conservation management | 101 | 2012 | 2015 | 2020 |
| Water supply | 91 | 2010 | 2015 | 2020 |
| Carbon dioxide | 79 | 2019 | 2021 | 2022 |
| Nature conservation | 73 | 2010 | 2015 | 2019 |
| Land use | 71 | 2009 | 2013 | 2019 |