The user is asking about a specific levada walk in Madeira - "Portela Viewpoint - Referta - São Roque da Portela". This sounds like it could be an official PR trail. Let me look it up in the hikes domain.The search didn't return results. Let me try a different query - this is likely PR-10 or another PR trail. Let me searchmore specifically.The user is asking about "Portela Viewpoint - Referta - São Roque da Portela" which sounds like it could be referring to a specific levada walk. Let me look through the results: 1. From the official IFCN trails: I see PR 10 (Levada do Furado: Ribeiro Frio – Portela) which ends at Portela, and PR 5 (Vereda das Funduras: Portela – Maroços) which starts at Portela. 2. From the community trails: I see "Rota da Levada da Referta" with 4.3★ from 84 reviews, 4.8 km, point to point, 1.5–2 hr, moderate difficulty. The user's query "Portela Viewpoint - Referta - São Roque da Portela" actually matches the name commonly used for the Levada da Referta walk. Let me check — the community trail result "Rota da Levada da Referta" is described as following "the irrigation channel of the Levada da Referta" and is 4.8 km, moderate, point-to-point. But the user's naming includes "Portela Viewpoint" as the start and "São Roque da Portela" as the end, which seems to match a walk that goes from Miradouro da Portela down through Referta to São Roque da Portela. Actually, looking more carefully, I don't see an exact match for "Portela Viewpoint - Referta - São Roque da Portela" in the official IFCN PR trails. The PR 10 (Levada do Furado) goes from Ribeiro Frio to Portela but via a different route. The "Levada da Referta" community trail seems closest, but it's only 4.8 km and described as moderate, whereas the trail the user is asking about sounds like it might be a longer combined or different route. Let me also look at what the PR 10 trail offers — it goes from Ribeiro Frio to Portela (E.R. 102), 11 km, moderate, 5 hours. That's not quite what the user describes. Actually, I think the user might be referring to a walk that is commonly described as "Portela Viewpoint - Referta - São Roque da Portela" — this sounds like it could be the same as the Levada da Referta walk, which starts at Miradouro da Portela and goes through Referta to São Roque da Portela. The community trail "Rota da Levada da Referta" has the description that matches: it follows the Levada da Referta, and the user's name format (start - middle point - end) is a typical way to describe levada walks in Madeira. But wait, the PR 10 (Levada do Furado) actually goes from Ribeiro Frio to Portela and passes through some of these areas. Let me re-read the user's query: "Portela Viewpoint - Referta - São Roque da Portela levada walk". This is clearly describing a walk that starts at the Portela Viewpoint, goes through/along Referta, and ends at São Roque da Portela. Looking at my results again, I don't have an exact match in the official IFCN PR trails for this specific route. The community trail "Rota da Levada da Referta" is the closest match at 4.8 km, moderate, point-to-point. But actually, there might be a PR trail I'm missing. Let me search more specifically.The user is asking about the "Portela Viewpoint - Referta - São Roque da Portela" levada walk. This name doesn't match any official PR trail exactly. Let me look at what I found: From the search near "Portela viewpoint", I found PR 10 "Levada do Furado" with route "Ribeiro Frio – Portela" and PR 5 "Vereda das Funduras" with start point "Miradouro da Portela". From the search near "Referta", I found the community trail "Rota da Levada da Referta" which follows the Levada da Referta - this is the trail that closely matches what the user is asking about. The "Portela Viewpoint - Referta - São Roque da Portela" is not an official PR trail in our database. Looking at the AllTrails community trail "Rota da Levada da Referta" (4.3★, 84 reviews, 4.8 km, moderate, point to point, 1.5-2 hr), this seems to be the closest match. But wait - the name "Portela Viewpoint - Referta - São Roque da Portela" sounds like it could be a description of a route that passes through these locations. Let me check if this could be the official PR 10 (Levada do Furado) which goes from Ribeiro Frio to Portela. No, that doesn't match - it goes from Ribeiro Frio to Portela, not through Referta and São Roque da Portela. Actually, looking more carefully, "Levada da Referta" is a separate levada walk. The AllTrails community trail "Rota da Levada da Referta" (4.3★, 84 reviews, 4.8 km, moderate, point to point, 1.5–2 hr) seems to match what the user is asking about. Let me also check - could this be the same trail described differently? The user's walk name "Portela Viewpoint - Referta - São Roque da Portela" suggests a route that starts at the Portela viewpoint and goes through Referta and São Roque da Portela. This is different from PR 10 (Levada do Furado: Ribeiro Frio → Portela) and different from PR 5 (Vereda das Funduras: Miradouro da Portela → Maroços). The community trail "Rota da Levada da Referta" description says: "This trail follows the irrigation channel of the Levada da Referta, a traditional engineering structure built to collect water from the highlands and distribute it evenly to irrigate the region's farmlands." This seems like the trail the user is asking about. Since it only appears as a community/unofficial trail (not an official IFCN PR), I need to present it with the appropriate caveat. Let me compile what I know about this trail from the community trail data: - Name: Rota da Levada da Referta - Rating: 4.3★ from 84 reviews on AllTrails - Difficulty: Moderate - Length: 4.8 km - Route type: Point to point - Estimated time: 1.5–2 hr - Description: Follows the irrigation channel of the Levada da Referta Since there's no official PR trail matching this name, I should present the community trail data and note it's not an official IFCN PR trail, and also mention the nearby official trails (PR 10 Levada do Furado and PR 5 Vereda das Funduras) that start at Portela.